Ballpoint pen



FIG. 1 is a left side elevational view of a ballpoint pen in accordance with my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top, front, right perspective view thereof; and,

FIG. 8 is a bottom, rear, left perspective view thereof. 

CLAIM The ornamental design for a ballpoint pen, as shown and described. 